Effects of compositions of filler, binder and porosity on elastic and fracture properties of nuclear graphite
Physical mechanisms at different length scales have to be taken into account while predicting the overall failure of nuclear graphite structures of advanced gas cooled graphite reactors. In this paper, the effect of composition of meso graphite phases and porosity on the aggregate elastic properties...
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| Format: | Article |
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Elsevier
2015
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| Online Access: | https://eprints.nottingham.ac.uk/35504/ |
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| author | Kyaw, Si Thu Sun, W. Becker, Adib A. |
| author_facet | Kyaw, Si Thu Sun, W. Becker, Adib A. |
| author_sort | Kyaw, Si Thu |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Physical mechanisms at different length scales have to be taken into account while predicting the overall failure of nuclear graphite structures of advanced gas cooled graphite reactors. In this paper, the effect of composition of meso graphite phases and porosity on the aggregate elastic properties is predicted using the Eshelby homogenisation method. Results indicate an overall decrease in elastic modulus with an increase in porosity. Subsequently, the moduli at different porosity levels are used to predict the critical strain energy release rates for crack propagation of graphite, and fracture behaviour is studied using compact tension and four point bending tests. Compared to flexural strength at zero porosity level, significant reduction in strength of up to 80% at 30% porosity level is observed. Evolution of flexural strength due to porosity is also compared against available experimental values of graphite from UK nuclear plants. |
| first_indexed | 2025-11-14T19:26:37Z |
| format | Article |
| id | nottingham-35504 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:26:37Z |
| publishDate | 2015 |
| publisher | Elsevier |
| recordtype | eprints |
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| spelling | nottingham-355042020-05-04T17:03:11Z https://eprints.nottingham.ac.uk/35504/ Effects of compositions of filler, binder and porosity on elastic and fracture properties of nuclear graphite Kyaw, Si Thu Sun, W. Becker, Adib A. Physical mechanisms at different length scales have to be taken into account while predicting the overall failure of nuclear graphite structures of advanced gas cooled graphite reactors. In this paper, the effect of composition of meso graphite phases and porosity on the aggregate elastic properties is predicted using the Eshelby homogenisation method. Results indicate an overall decrease in elastic modulus with an increase in porosity. Subsequently, the moduli at different porosity levels are used to predict the critical strain energy release rates for crack propagation of graphite, and fracture behaviour is studied using compact tension and four point bending tests. Compared to flexural strength at zero porosity level, significant reduction in strength of up to 80% at 30% porosity level is observed. Evolution of flexural strength due to porosity is also compared against available experimental values of graphite from UK nuclear plants. Elsevier 2015-02-02 Article PeerReviewed Kyaw, Si Thu, Sun, W. and Becker, Adib A. (2015) Effects of compositions of filler, binder and porosity on elastic and fracture properties of nuclear graphite. Journal of Nuclear Materials, 457 . pp. 42-47. ISSN 0022-3115 Nuclear graphite micromechanics graphite phases fracture mechanics http://www.sciencedirect.com/science/article/pii/S0022311514007557 doi:10.1016/j.jnucmat.2014.10.071 doi:10.1016/j.jnucmat.2014.10.071 |
| spellingShingle | Nuclear graphite micromechanics graphite phases fracture mechanics Kyaw, Si Thu Sun, W. Becker, Adib A. Effects of compositions of filler, binder and porosity on elastic and fracture properties of nuclear graphite |
| title | Effects of compositions of filler, binder and porosity on elastic and fracture properties of nuclear graphite |
| title_full | Effects of compositions of filler, binder and porosity on elastic and fracture properties of nuclear graphite |
| title_fullStr | Effects of compositions of filler, binder and porosity on elastic and fracture properties of nuclear graphite |
| title_full_unstemmed | Effects of compositions of filler, binder and porosity on elastic and fracture properties of nuclear graphite |
| title_short | Effects of compositions of filler, binder and porosity on elastic and fracture properties of nuclear graphite |
| title_sort | effects of compositions of filler, binder and porosity on elastic and fracture properties of nuclear graphite |
| topic | Nuclear graphite micromechanics graphite phases fracture mechanics |
| url | https://eprints.nottingham.ac.uk/35504/ https://eprints.nottingham.ac.uk/35504/ https://eprints.nottingham.ac.uk/35504/ |